印刷工艺制备毛细芯的孔隙结构与性能

doi:10.19976/j.cnki.43-1448/TF.2023011

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Abstract Using electrolytic dendritic copper powder with an average particle size of 55-112 μm as raw material and urea as pore forming agent, adding organic component binder, solvent and other organic matter to prepare slurry, using printing process to prepare capillary wick green, and then degreasing and sintering to prepare capillary wick with thickness of (0.2±0.02) mm. The effects of copper powder particle size, urea addition and slurry organic components on the pore structure and capillary performance of the capillary wick were studied. The results show that the addition of poreforming agent urea can increase the porosity, average pore size and permeability of the capillary wick structure, and reduce the capillary force and fractal dimension. As the particle size of copper powder decreases from 112 μm to 55 μm, the porosity, average pore size, average area, average perimeter, fractal dimension, permeability and capillary performanca parameters of the capillary wick all decrease, while the capillary force increases, its fractal dimension decreases from 1.39 to 1.20. The fractal dimension is related to the permeability, and as the permeability decreases, the fractal dimension decreases gradually. Its capillary performanca parameters are directly proportional to permeability and inversely proportional to capillary force. The capillary wick prepared by 112 μm copper powder has the best performance, the permeability is 2.02×10^-10 m², the capillary force (ΔP_c) is 1.29 kPa, and the capillary performanca parameter (ΔP_c·K) reaches 2.61×10^-7 N.

Key words： capillary wick capillary performance dendritic copper powder printing proces fractal dimension permeability capillary force

Received: 01 March 2023 Published: 06 July 2023

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	SHEN Peng
	CAI Yanbo
	WANG Dezhi
	LIU Xinli
	DUAN Bohua

Cite this article:

SHEN Peng,CAI Yanbo,WANG Dezhi, et al. Pore structure and properties of capillary wicks prepared by printing process[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(3): 233-243.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023011 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I3/233

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